#include <stddef.h>

#include "common.h"
#include "log.h"
#include "threads.h"
#include "dbcache.h"	// one
#include "ipc.h"
#include "mutexs.h"
#include "memalloc.h"
#include "strpool.h"
#include "zbxserver.h"
#include "zbxalgo.h"
#include "dbcache.h"	// two
#include "zbxregexp.h"
#include "cfg.h"
#include "zbxtasks.h"
#include "../zbxcrypto/tls_tcp_active.h"
#include "dbcache.h"	// three

#define ZBX_DBCONFIG_IMPL
#include "dbconfig.h"
#include "dbsync.h"

...